a)
[tex]6x + 4 = 2x \\ 4x = - 4 \\ x = - 1[/tex]
b)
[tex]3x - 4 = 5x \\ - 2x = 4 \\ x = - 2[/tex]
c)
[tex] - 2x + 7 = 6x - 9 \\ - 8x = - 16 \\ x = 2[/tex]
d)
[tex] - 2x = 7x + 18 \\ - 9x = 18 \\ x = - 2[/tex]
e)
[tex] - 4x + 5 = 25 - 9x \\ 5x = 20 \\ x = 4[/tex]
